Brake.



PATENTED JULY 10, 1906. 7

0. W'. LARSON.

BRAKE.

APPLICATION FILED FEB.19. 1904.

2 SHEETS-SHEET 1.

Witnesses:

PATENTED JULY 10, 1906.

C. W. LARSON.

BRAKE.

APPLICATION FILED FEB.19. 1904.

2 SHEETS-SHEET 2.

. Inventor":

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Witnesses: I

Carl W. Larson,

snares PATENT orrron.

CARL W. LARSON OF SOHENEOTADY, YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

BRAKE.

Specification of Letters Patent.

Patented July 10, 1906.

Application filed February 19. 1904. Serial No. 194,317. I

To (all whom, it may concern:

Be it known that I, CARL WHLARSON, a citizen of' the United States, residing at Schenectady, in the county of Scheiiect-ady and State of New York, have invented certain new and useful Improvementsin Brakes,

of which the following is a specification.

'coil, and still another inemploying a flanged outer element mounted upon the motor, so that the more complicated parts of the brake mechanism will be practically inclosed, and thereb protected from injury. These and other i eatures of my invention will be best understood by reference to the following description, taken in connection with the accompanying drawings, in which I have shown one embodiment of'the invention, and the parts, combinations; and improvements which I regard as my invention will be specifically olnted out in the appended claims.

In said drawings, Figure 1 is an elevation illustrating a brake embodying the features of the invention applied to an electric motor.

.Fig. 2 is aside view of the brake mechanism I viewed from the left in Fig. 1, and Fl 3 is a sectional viewillustrating the rotatable element of the brake in section and a portion of the fixed element in section on the line 3 '3 of Throughout the-figures like characters refer to like parts.

; clad typ securely keyed a flanged member '16, which constitutes the rotatable element of the brake. AS clearly illustrated, the flange 17 of the member 16 extends toward the casing of the motor, so as to fully protect the interior parts of the brake. The other element of the brake comprises a fixed member 18,

of nommagnetic metal, which is provided with four laterally-proj ecting lugs through which it is adapted to be connected to the -head 12 of the motor-casing. This connection may be made in any desired mannet, and in the present case I have shown the lugs 19 bolted to cooperating lugs 20 on the motor-head 12.

The fixed member 18 is provided at four points with pole-pieces 24 24, of iron or other magnetic material, which are symmetrically arranged and constitute the pole-pieces of four magnets adapted to draw the friction members 25 out of engagement with the flange 17 of the rotatable member 16. These pole-pieces are built up of laminations and are secured by bolts 26 to the member 18 at one end and through the agency of the exterior plate 27 and bolts 28 are fitted to a yoke 29 at the other end. Located within the space thus formed 18 3.11 energizing-coil 30,

which is concentrically arranged with reference to the member 18 and serves to energize all the magnets of the brake. The friction members 25, which cooperate with the brake-magnets, are each composed of a brake-shoe 31, of wood or other suitable material, and an armature 32, formed of laminations of iron or other magnetic material. The shoe 31 and the armature "32 are securely clamped between the members 33 33 by bolts 34. The members 33 are provided with overhanging portions, between which and corresponding shoulders on the fixed member 18 are located coiled springs35.

These springs are compressed by the action of the magnet in drawin the armatures inward and serve to force tie armatures outward when the magnets are denergized.

. From the description thus far it will be seen that when current is su plied to the coil the pole-pieces 24 of eac ma et will be magnetized and the shoes 31 wil be drawn out of engagement with the flange 17. As soon as the current is out 011, however, the springs will force the shoes 31 outward into engagement with the flange, so as to apply the brakes. By bringing the point of contact of the shoes 31 and the rotatable element of the brake near the periphery of O ber andiafixed member, of radiall .arranged the latter a maximum braking effect is. ob-

a direct current.

tainable with a minimum of space for the operating parts. By laminating the poleieces 24, armature 32', and yoke 29 the rake may be used with either alternating or- Of course where the brake is intended for use with direct current only the pole-pieces 24, armature 32, and yoke 29 may be solid. It will also be clear that when the coil is supplied with alternating current the fixed mem er 18 being located so close to the coil would ordinaril form a closed secondary circuit. In or er to prevent this,

member is split at one point and the conti uous surfaces separated by suitable insuliation 36. This insulation interrupts the electric continuity of the member 18, and thus prevents the induction of a current therein. It is obvious that the coil 30 may be included directly in circuit with the motor or in shunt thereto or in an. independent circuit. When included. in circuit with the motor, which is a common arrangement, as

soon as the motor-current. is cut off. the coil 3.0-is deenergized and; the brake is applied.

Although I have shown and described my invention 'as embodied in a magnetic brake, it is clear that the same structure may be emplayed in clutch, mechanism and that many of the features may be employed in other connections without departing from the irit of m invention. It will a sobe clear from the above description. that many alterations and, modifications may be made in the specific construction illustrated without departin from the spirit of my invention, and I there. ore do not wish t be limited to such. construction, but aim to cover by the terms of the a v pended claims all; such. alterations and modi cations.

What I claim as new, and desire to secureby Letters Patent ofthe United States, is-

L. The combination with arotat abl'ememberanda fixed member, ofrad'iallf' arrangedl ma .ets connected to one of said? members, frie ion members movable relative to, said magnets into. and out of. eng ement with the other of; said members, an 1 a common ener ifzing-coil for said magnets.

2. he combination with a rotatable memmagnets connected to said fixe member,

friction, members movable relative to said ma nets into and out of engagement, with sa' rotatable-member, and a common energizing-coil for said magnets.

3. he combination wi h a. rotatable member and a fixed member, of radially-arranged magnets connected to said fixed member,

frictionmembers radially movable with refi.

erence to said magnets into and out of en,- gagement with said rotatable member,.and a: common energizing-coil for said magnets.

4. The combinationwith arotatable memher having a laterally-projectingflange, and.

afixed member located within said rotatable member, of one or more magnets secured to said fixed member, armatures therefor lo.- cated between said magnets and said flange, frictionrshoes carried by said. ai -matures, and springs forpressing said armatures outwar l to bring said shoes into en agement with magnets to. disengage said shoes.

5. The combination with a rotatable member having a laterallyzprojecting flange, and i a fixed member locate within said rotatable imember, of a concentrically-arranged ener- 1 gizing-coil, pole-pieces for one or more magnets secured to said fixed member adjacent -to said coil, armatures therefior located be- .tween said pole-pieces and said flange, friction-shoes carried by said armatures, and springs for pressing said armatures. outward to. bring said shoes into engagement with said flange in opposition to t e pull of said 1 magnets to disengage said shoes. 6. The combination with a rotatable memher having a laterally-projecting flange, and 1 a fixed member located within said rotatable }member of a concentrically-arranged enerlgizing-coil, laminated p0le-pieces for one or. more magnets lying on opposite sides. of'saildi lcoil', laminated armatures therefor located 2 between said pole-pieces and: said flange, fii'c' tion-shoes carried by said armatures, and i springs for pressing said armatures outward ito. bring. said; shoes into eniagement with Esaid flange in opposition to t pull on said i magnets to disengage said shoes. 1 7. The combination witharotatable mermher having, a laterally-projecting, and

member, of a concentrically-arranged ens;- is

said ed member, pole-piecesfor'aplurality i of magnets-located adjacent. to; said coil}. and 'gfi'lGl'iOD: members. comprising armatures; lo.- cated adjacent to. the outer ends.- ofsaid: pole.- gpi'eces and, movable into and out ofi? engagement with said flange.

, 8. The-combination witha rotatable memiber having a. laterally-projecting flange, and a. fixed member located. said rotatable. Emember, of a concentrically-arranged enermem er, and insulation for breakin the cleartric continuity of said fixed memer, lami' gnated pole-pieces for a. plurality of. magnets flocated" adjacent to said coil, and friction ;members comprising. laminated armatures 1 located adijacent. to the outer end. ofsaidipolepieces an Imovable into and; out. ofi'engage ment with said flange.

p 9.. The combination witharotatable membe]: having a laterally-projecting: flange andl a fi'xed'member located' within said rotatable: ;member,, of aconcentrically-arranged energizing-coillocated'inthe plane of and within said; fixed member, pole-pieces, for one' or:

-coil' located in the plane. of and within I said flange in opposition to t e pull of said 1 '1 a fixed member located within said rotatable Qgi'zin .-coil. located in. the. plane of said fi'xedi more magnets secured at their outer ends to said fixed member and extending inward on opposite sides of said energizing-coil, and friction members comprising armatures guided within said fixed member and located adjacent to the outer end of said polepieces and movable into and out of engagement with said flan e.

10. The com ination with a rotatable member, a fixed member, and friction-shoes carried by one of said members and adapted to frictionally engage the other, of means for moving saidshoes into and out of frictional engagement, comprising a plurality of electromagnets having a common energizing-coil.

11. The combination \m'th a rotatable member, a fixed member, and friction-shoes carried by one of-said members and adapted to frictionally engage the other, of means for moving said shoes into and out of frictional engagement, comprising a plurality of concentrically-arranged electromagnets having a common ener 'zing-coil. 12. The com ination with a rotatable memher, a fixed member, and friction-shoes carried by one of said members and adapted to frictionally engage the other, of means for moving said shoes into and out of frictional engagement, comprisinga plurality of radicasing and extending within said flanged" member, friction-shoes carried by said fixed member and movable into and out of engagement with said rotatable member, and means for moving said shoes into and out of such enga ement. I

n witness whereof I have hereunto set my hand this 17th day of February, 1904.

. CARL W. LARSON.

Witnesses:

BENJAMIN B. HULL, HELEN ORFORD. 

